2007 GMC Yukon Owner's Manual - Page 142

Automatic Transmission Operation There are several different positions for the shift lever. {CAUTION: It is dangerous to get out of your vehicle if the shift lever is not fully in PARK (P) with the parking brake firmly set. Your vehicle can roll. Do not leave your vehicle when the engine is running unless you have to. If you have left the engine running, the vehicle can move suddenly. You or others could be injured. To be sure your vehicle will not move, even when you are on fairly level ground, always set your parking brake and move the shift lever to PARK (P). See Shifting Into Park (P) on page 152. If you are pulling a trailer, see Towing a Trailer on page 405. Your vehicle has an automatic transmission with an electronic shift position indicator within the instrument panel cluster. This display will show the position anytime the shift lever is moved out of PARK (P). PARK (P): This position locks your rear wheels. It is the best position to use when you start your engine because your vehicle cannot move easily. 142